<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>奔跑的小熊</title>
    <style>
        body{
            overflow: hidden;
            background-color: #ccc;
        }
        div.bearSelf{
            position: absolute;
            bottom: 100px;

            width: 200px;
            height: 100px;
            background: url(media/bear.png) no-repeat;

            /* 调用bear和move动画 */
            animation: bear 1s steps(8) infinite, move 3s forwards;
            /* 背景图片是设计好的8个,水平排布好的,定格动画 */
            /* 用8步(1200/200)完成了1600px宽度背景图片,在200px宽度的相框盒子里,的水平移动,达成视觉电视效果(例如翻页漫画)*/
            /* steps(n) 步长,表示分n步完成一段动画 */
        }
        /* 熊本身定格动画 */
        @keyframes bear{
            0% {
                background-position: 0 0;
            }
            100%{
                background-position: -1600px 0;
            }
        }
        /* 整***置移动 */
        @keyframes move{
            0% {
                left: 0;
            }
            100%{
                left: 50%;
                /* margin-left: -100px; */
                transform: translateX(-50%);
            }
        }
        /* 天空 */
        .sky{
            width: 25600px;
            height: 800px;
            background: url(media/bg3.png) no-repeat;
        }
        /* 山的缓动 */
        .mounF{
            position: absolute;
            width: 3840px;
            height: 336px;
            bottom: 0;
            background: url(media/bg1.png) no-repeat;

            animation: moun 60s infinite linear;
            animation-delay: 1.6s;
        }
        .mounB{
            position: absolute;
            width: 3840px;
            height: 569px;
            top: 200px;
            background: url(media/bg2.png) no-repeat;
            animation: moun 120s infinite linear;
            animation-delay: 1.6s;
        }

        @keyframes moun{
            0% {
                background-position: 0 0;
            }
            100%{
                background-position: -1600px 0;
            }
        }
    </style>
</head>
<body>
    <!-- 天空 -->
    <div class="sky"></div>
     <!-- 后面的山 -->
     <div class="mounB">
    </div>
    <!-- 前山 -->
    <div class="mounF">
    </div>
    <!-- 动画相框 -->
    <div class="bearSelf">
    </div>

</body>
</html>